WO2010150748A1 - 光配向性を有する熱硬化膜形成組成物 - Google Patents

光配向性を有する熱硬化膜形成組成物 Download PDF

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WO2010150748A1
WO2010150748A1 PCT/JP2010/060479 JP2010060479W WO2010150748A1 WO 2010150748 A1 WO2010150748 A1 WO 2010150748A1 JP 2010060479 W JP2010060479 W JP 2010060479W WO 2010150748 A1 WO2010150748 A1 WO 2010150748A1
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component
photo
film
thermosetting film
group
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PCT/JP2010/060479
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English (en)
French (fr)
Japanese (ja)
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真 畑中
安達　勲
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日産化学工業株式会社
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Priority to CN201080025357.5A priority Critical patent/CN102460288B/zh
Priority to US13/377,331 priority patent/US9733519B2/en
Priority to EP10792066.2A priority patent/EP2447769B1/en
Priority to JP2011519887A priority patent/JP5459520B2/ja
Priority to KR1020127001516A priority patent/KR101724107B1/ko
Publication of WO2010150748A1 publication Critical patent/WO2010150748A1/ja

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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1337—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
    • G02F1/13378—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers by treatment of the surface, e.g. embossing, rubbing or light irradiation
    • G02F1/133788—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers by treatment of the surface, e.g. embossing, rubbing or light irradiation by light irradiation, e.g. linearly polarised light photo-polymerisation
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/13363—Birefringent elements, e.g. for optical compensation
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L33/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides or nitriles thereof; Compositions of derivatives of such polymers
    • C08L33/04—Homopolymers or copolymers of esters
    • C08L33/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, which oxygen atoms are present only as part of the carboxyl radical
    • C08L33/062—Copolymers with monomers not covered by C08L33/06
    • C08L33/066—Copolymers with monomers not covered by C08L33/06 containing -OH groups
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K19/00—Liquid crystal materials
    • C09K19/52—Liquid crystal materials characterised by components which are not liquid crystals, e.g. additives with special physical aspect: solvents, solid particles
    • C09K19/54—Additives having no specific mesophase characterised by their chemical composition
    • C09K19/56—Aligning agents
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/133345—Insulating layers
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1337—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
    • G02F1/133711—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers by organic films, e.g. polymeric films
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2457/00—Electrical equipment
    • B32B2457/20—Displays, e.g. liquid crystal displays, plasma displays
    • B32B2457/202—LCD, i.e. liquid crystal displays
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
    • C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
    • C08F220/10—Esters
    • C08F220/26—Esters containing oxygen in addition to the carboxy oxygen
    • C08F220/30—Esters containing oxygen in addition to the carboxy oxygen containing aromatic rings in the alcohol moiety
    • C08F220/302—Esters containing oxygen in addition to the carboxy oxygen containing aromatic rings in the alcohol moiety and two or more oxygen atoms in the alcohol moiety
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K2323/00—Functional layers of liquid crystal optical display excluding electroactive liquid crystal layer characterised by chemical composition
    • C09K2323/02—Alignment layer characterised by chemical composition
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133509—Filters, e.g. light shielding masks
    • G02F1/133514—Colour filters
    • G02F1/133519—Overcoatings
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/13363—Birefringent elements, e.g. for optical compensation
    • G02F1/133633—Birefringent elements, e.g. for optical compensation using mesogenic materials
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F2202/00—Materials and properties
    • G02F2202/02—Materials and properties organic material
    • G02F2202/022—Materials and properties organic material polymeric
    • G02F2202/023—Materials and properties organic material polymeric curable
    • G02F2202/025—Materials and properties organic material polymeric curable thermocurable

Definitions

  • the present invention relates to a thermosetting film-forming composition having photo-alignment properties and a cured film formed therefrom. More specifically, the present invention relates to a thermosetting film-forming composition having high transparency, liquid crystal alignment ability, high solvent resistance and heat resistance in a thermosetting film, and application of the thermosetting film.
  • the thermosetting film-forming composition having photo-alignment property of the present invention is particularly suitable for a color filter overcoat agent having a polymerizable liquid crystal alignment function for forming a built-in retardation layer in a liquid crystal display.
  • a protective film is provided to prevent the element surface from being exposed to a solvent or heat during the manufacturing process.
  • This protective film is required not only to have high adhesion to the substrate to be protected and high solvent resistance, but also to have excellent performance such as heat resistance.
  • a protective film is used as a protective film for a color filter used in a color liquid crystal display device or a solid-state imaging device, it is highly transparent to maintain the transmittance of light transmitted through the color filter. It is required that the film has a property.
  • phase difference material a phase difference material
  • a polymerizable liquid crystal solution is applied and aligned, and then light is applied.
  • Cured materials are commonly used.
  • the lower layer film needs to be a material having orientation after rubbing treatment or polarized UV irradiation. Therefore, after forming a liquid crystal alignment layer on the overcoat of the color filter, a retardation material is formed (see FIG. 1A). If a film (see FIG. 1B) that also serves as an overcoat of the liquid crystal alignment layer and the color filter can be formed, great advantages such as cost reduction and a reduction in the number of processes can be obtained. A material that can also be used is strongly desired.
  • acrylic resin is used for the overcoat of the color filter.
  • glycol solvents such as propylene glycol monomethyl ether and propylene glycol monomethyl ether acetate
  • ester solvents such as ethyl lactate and butyl lactate
  • ketone solvents such as cyclohexanone and methyl amyl ketone
  • acrylic resins have been heat-cured or photo-cured to improve heat resistance and solvent resistance (Patent Documents 1 and 2).
  • Patent Documents 1 and 2 thermosetting or photo-curing acrylic resins have appropriate transparency and solvent resistance, they exhibit sufficient orientation even when rubbing or irradiating polarized UV irradiation with this type of acrylic resin overcoat. I could't.
  • the liquid crystal alignment layer described in Patent Document 3 has a problem of low transparency when used as an overcoat material for a color filter.
  • Polyimides and polyamic acids are soluble in solvents such as N-methylpyrrolidone and ⁇ -butyrolactone, but have low solubility in glycol solvents, ester solvents, and ketone solvents, so that such solvents can be used. It is difficult to apply to the coat production line.
  • the liquid crystal alignment layer is irradiated with a normal polarized UV exposure (for example, 100 mJ / cm 2 ), the photodimerization reaction rate is low and not sufficiently crosslinked. The solvent resistance and heat resistance are low. Therefore, when a polymerizable liquid crystal is applied to form a phase difference material layer on the liquid crystal alignment layer, the liquid crystal alignment layer is dissolved and cannot exhibit sufficient alignment.
  • the exposure dose is increased to 1 J / cm 2 or more in order to increase the photodimerization reaction rate, the orientation of the polymerizable liquid crystal is improved, but the exposure time becomes very long, so it cannot be said as a practical method. .
  • the material used for the conventional liquid crystal alignment layer was a material having only a photodimerization site as a cross-linking site, the number of cross-linking sites is small as a whole, and the liquid crystal alignment layer produced has sufficient heat resistance. It will not be. For this reason, there is a concern that the liquid crystal alignment layer contracts greatly during the manufacturing process of the display element performed at 200 ° C. or higher after the retardation material is formed.
  • An object of the present invention is to provide a film and a thermosetting film-forming composition having a light distribution property for forming the film. Further, the problem to be solved by the present invention is that it has a light distribution property that can be dissolved in a glycol solvent, a ketone solvent, or a lactic acid ester solvent that can be applied in the production of a color filter overcoat during the formation of a cured film. It is providing the thermosetting film forming composition.
  • thermosetting film-forming composition having photo-alignment properties comprising an acrylic copolymer having a photodimerization site and a thermal crosslinking site as component (A) and a crosslinking agent as component (B)
  • A acrylic copolymer having a photodimerization site and a thermal crosslinking site
  • B crosslinking agent
  • the component (A) has a photo-alignment property according to the first aspect, which is an acrylic copolymer obtained by a polymerization reaction of a monomer containing a monomer having a photodimerization site and a monomer having a thermal crosslinking site.
  • the present invention relates to a thermosetting film forming composition.
  • the present invention relates to a thermosetting film-forming composition having a photo-alignment property according to the first aspect or the second aspect, wherein the photodimerization site of the component (A) is a cinnamoyl group.
  • the present invention relates to a thermosetting film-forming composition having photo-alignment property according to any one of the first aspect to the third aspect, in which the thermal crosslinking site of the component (A) is a hydroxy group.
  • thermosetting film-forming composition having a photoalignment property according to any one of the first to fourth aspects, wherein the crosslinking agent of the component (B) is a crosslinking agent having a methylol group or an alkoxymethylol group.
  • the crosslinking agent of the component (B) is a crosslinking agent having a methylol group or an alkoxymethylol group.
  • the present invention further relates to a thermosetting film-forming composition having a photo-alignment property according to any one of the first aspect to the fifth aspect, which further contains an acid or a thermal acid generator as a component (C).
  • the present invention further relates to a thermosetting film-forming composition having a photo-alignment property according to any one of the first to sixth aspects, further containing a sensitizer as a component (D).
  • the present invention relates to a thermosetting film-forming composition.
  • thermosetting film formation composition which has the photo-alignment property as described in a 7th viewpoint.
  • the light according to any one of the seventh to ninth aspects containing 0.1 to 20 parts by mass of the component (D) based on 100 parts by mass of the component (A).
  • the present invention relates to a thermosetting film-forming composition having orientation.
  • the present invention relates to a liquid crystal alignment layer formed from the thermosetting film-forming composition having a photoalignment property according to any one of the first to tenth aspects.
  • thermosetting film-forming composition having the photoalignment property according to any one of the first aspect to the tenth aspect is provided together with a retardation layer thereon.
  • thermosetting film forming composition having photo-alignment property of the present invention can form a cured film having liquid crystal alignment ability (photo-alignment property) by light irradiation in addition to high transparency, high solvent resistance, and high heat resistance. It can be used as a material for forming a photo-alignment liquid crystal alignment film and an overcoat.
  • a “polymerizable liquid crystal alignment layer” that combines the characteristics of both the layer for aligning the polymerizable liquid crystal for forming the retardation material in the display cell and the overcoat layer of the color filter at once. Therefore, it is possible to realize cost reduction by simplifying the manufacturing process and reducing the number of processes.
  • thermosetting film-forming composition having photo-alignment property of the present invention is soluble in glycol solvents, ketone solvents, and lactic acid ester solvents, an overcoat production line for color filters that mainly uses these solvents. Can be suitably used.
  • a liquid crystal cell having a color filter (CF) overcoat having an orientation using a liquid crystal cell (a) having a liquid crystal orientation film formed by a conventional technique and the thermosetting film-forming composition having a photo-alignment property of the present invention It is a model figure shown by contrasting with b).
  • the present invention is characterized in that in addition to the above-described transparency, solvent resistance, and heat resistance, the performance of liquid crystal alignment ability (photo-alignment) by light irradiation is improved. That is, this invention relates to the thermosetting film forming composition which has the photo-orientation property containing the acrylic copolymer which has the photodimerization site
  • the present invention relates to a film-forming composition.
  • the thermosetting film having photo-alignment refers to a film cured by heating in which optical anisotropy is induced by irradiating linearly polarized light.
  • the component (A) is an acrylic copolymer having a photodimerization site and a thermal crosslinking site.
  • the acrylic copolymer a copolymer obtained by polymerizing a monomer having an unsaturated double bond such as acrylic acid ester, methacrylic acid ester or styrene can be applied.
  • the acrylic copolymer (A) having a photodimerization site and a thermal crosslinking site (hereinafter also referred to as a specific copolymer) may be any acrylic copolymer having such a structure, and constitutes the acrylic copolymer. There is no particular limitation on the main chain skeleton and side chain type of the polymer.
  • part is a site
  • a cinnamoyl group, a chalcone group, a coumarin group, an anthracene group etc. are mentioned as the specific example.
  • a cinnamoyl group having high transparency in the visible light region and photodimerization reactivity is preferable.
  • a more preferable structure of the cinnamoyl group is represented by the following formula [1] or formula [2].
  • X 1 represents a hydrogen atom, an alkyl group having 1 to 18 carbon atoms, a phenyl group or a biphenyl group.
  • the phenyl group and the biphenyl group may be substituted by either a halogen atom or a cyano group.
  • X 2 represents a hydrogen atom, a cyano group, an alkyl group having 1 to 18 carbon atoms, a phenyl group, a biphenyl group or a cyclohexyl group.
  • the alkyl group having 1 to 18 carbon atoms, the phenyl group, the biphenyl group, and the cyclohexyl group may be bonded via a covalent bond, an ether bond, an ester bond, an amide bond, or a urea bond.
  • the thermal crosslinking site is a site that is bonded to the crosslinking agent by heating, and specific examples thereof include a hydroxy group, a carboxyl group, and a glycidyl group.
  • the acrylic copolymer as the component (A) preferably has a weight average molecular weight of 3,000 to 200,000, more preferably 4,000 to 150,000, and 5,000 to 100,000. Even more preferably it is. If the weight average molecular weight is over 200,000, the solubility in the solvent may be reduced and the handling property may be reduced. If the weight average molecular weight is less than 3,000, There may be insufficient curing during curing and solvent resistance and heat resistance may decrease.
  • a monomer having a photodimerization site and a monomer having a thermal crosslinking site are copolymerized.
  • the method to do is simple.
  • Examples of the monomer having a photodimerization site include monomers having a cinnamoyl group, a chalcone group, a coumarin group, or an anthracene group.
  • a monomer having a cinnamoyl group having good transparency in the visible light region and good photodimerization reactivity is particularly preferable.
  • a monomer having a cinnamoyl group having a structure represented by the above formula [1] or [2] is more preferable. Specific examples of such monomers are shown in the following formula [3] or formula [4].
  • X 1 represents a hydrogen atom, an alkyl group having 1 to 18 carbon atoms, a phenyl group or a biphenyl group. In that case, the phenyl group and the biphenyl group may be substituted by either a halogen atom or a cyano group.
  • X 2 represents a hydrogen atom, a cyano group, an alkyl group having 1 to 18 carbon atoms, a phenyl group, a biphenyl group, or a cyclohexyl group.
  • the alkyl group having 1 to 18 carbon atoms, the phenyl group, the biphenyl group, and the cyclohexyl group may be bonded via a covalent bond, an ether bond, an ester bond, an amide bond, or a urea bond.
  • X 3 and X 5 each independently represent a single bond, an alkylene group having 1 to 20 carbon atoms, an aromatic ring group, or an aliphatic ring group.
  • the alkylene group having 1 to 20 carbon atoms may be branched or linear.
  • X 4 and X 6 represent a polymerizable group. Specific examples of the polymerizable group include acryloyl group, methacryloyl group, styrene group, maleimide group, acrylamide group, and methacrylamide group.
  • Examples of the monomer having a thermal crosslinking site include 2-hydroxyethyl acrylate, 2-hydroxyethyl methacrylate, 2-hydroxypropyl acrylate, 2-hydroxypropyl methacrylate, 4-hydroxybutyl acrylate, 4-hydroxybutyl methacrylate, 2,3 -Dihydroxypropyl acrylate, 2,3-dihydroxypropyl methacrylate, diethylene glycol monoacrylate, diethylene glycol monomethacrylate, caprolactone 2- (acryloyloxy) ethyl ester, caprolactone 2- (methacryloyloxy) ethyl ester, poly (ethylene glycol) ethyl ether acrylate, Poly (ethylene glycol) ethyl ether methacrylate, 5-acryloyl Monomers having a hydroxy group such as cis-6-hydroxynorbornene-2-carboxyl-6-lactone, 5-methacryloyloxy-6-hydroxynorbornene-2-carboxy
  • a specific functional group copolymerizable with the monomer is added.
  • Monomers that do not have can be used in combination.
  • Such monomers include acrylic ester compounds, methacrylic ester compounds, maleimide compounds, acrylamide compounds, acrylonitrile, maleic anhydride, styrene compounds and vinyl compounds.
  • acrylic ester compound examples include methyl acrylate, ethyl acrylate, isopropyl acrylate, benzyl acrylate, naphthyl acrylate, anthryl acrylate, anthryl methyl acrylate, phenyl acrylate, glycidyl acrylate, 2,2,2-trifluoroethyl acrylate.
  • methacrylic acid ester compound examples include methyl methacrylate, ethyl methacrylate, isopropyl methacrylate, benzyl methacrylate, naphthyl methacrylate, anthryl methacrylate, anthryl methyl methacrylate, phenyl methacrylate, glycidyl methacrylate, 2,2,2-trifluoroethyl methacrylate.
  • vinyl compound examples include methyl vinyl ether, benzyl vinyl ether, vinyl naphthalene, vinyl carbazole, allyl glycidyl ether, 3-ethenyl-7-oxabicyclo [4.1.0] heptane, 1,2-epoxy-5-hexene. And 1,7-octadiene monoepoxide.
  • styrene compound examples include styrene, methyl styrene, chlorostyrene, and bromostyrene.
  • maleimide compound examples include maleimide, N-methylmaleimide, N-phenylmaleimide, and N-cyclohexylmaleimide.
  • the amount of each monomer used to obtain the specific polymer is, based on the total amount of all monomers, a monomer having a photodimerization site of 25 to 90 mol%, a monomer having a thermal crosslinking site of 10 to 75 mol%, A monomer having no specific functional group of 0 to 65 mol% is preferable.
  • a monomer having a photodimerization site is less than 25 mol%, it is difficult to impart high-sensitivity and good liquid crystal alignment.
  • the content of the monomer having a thermal crosslinking site is less than 10 mol%, it is difficult to impart sufficient thermosetting property, and it is difficult to maintain high sensitivity and good liquid crystal alignment.
  • the method for obtaining the specific copolymer used in the present invention is not particularly limited.
  • a solvent in which a monomer having a specific functional group, a monomer not having the specific functional group if desired, and a polymerization initiator coexist It can be obtained by a polymerization reaction at a temperature of 50 to 110 ° C.
  • the solvent used will not be specifically limited if it dissolves the monomer which has a specific functional group, the monomer which does not have the specific functional group used depending on necessity, a polymerization initiator, etc. Specific examples are described in ⁇ Solvent> described later.
  • the specific copolymer obtained by the above method is usually in a solution state dissolved in a solvent.
  • the solution of the specific copolymer obtained by the above method is poured into diethyl ether or water under stirring to cause reprecipitation, and after the generated precipitate is filtered and washed, under normal pressure or reduced pressure, It can be dried at room temperature or heat to obtain a powder of the specific copolymer.
  • the polymerization initiator and unreacted monomer coexisting with the specific copolymer can be removed, and as a result, a purified powder of the specific copolymer is obtained. If sufficient purification cannot be achieved by a single operation, the obtained powder may be redissolved in a solvent and the above operation may be repeated.
  • the specific copolymer may be used in the form of a powder or in the form of a solution obtained by re-dissolving the purified powder in a solvent described later.
  • the specific copolymer of component (A) may be a mixture of a plurality of types of specific copolymers.
  • (B) component of this invention is a crosslinking agent couple
  • the crosslinking agent include compounds such as an epoxy compound, a methylol compound, and an isocyanate compound, and a methylol compound is preferable.
  • methylol compound examples include compounds such as alkoxymethylated glycoluril, alkoxymethylated benzoguanamine, and alkoxymethylated melamine.
  • alkoxymethylated glycoluril include, for example, 1,3,4,6-tetrakis (methoxymethyl) glycoluril, 1,3,4,6-tetrakis (butoxymethyl) glycoluril, 1,3,4 , 6-tetrakis (hydroxymethyl) glycoluril, 1,3-bis (hydroxymethyl) urea, 1,1,3,3-tetrakis (butoxymethyl) urea, 1,1,3,3-tetrakis (methoxymethyl) Examples include urea, 1,3-bis (hydroxymethyl) -4,5-dihydroxy-2-imidazolinone, and 1,3-bis (methoxymethyl) -4,5-dimethoxy-2-imidazolinone.
  • glycoluril compounds (trade names Cymel 1170, Powder Link 1174) manufactured by Mitsui Cytec Co., Ltd.
  • methylated urea resins (trade name UFR65), butylated urea resins (trade names UFR300, U-VAN10S60, U-VAN10R, U-VAN11HV), urea / formaldehyde resin (high condensation type, trade name Becamine J-300S, Becamine P-955, Becamine N) manufactured by Dainippon Ink & Chemicals, Inc.
  • alkoxymethylated benzoguanamine include tetramethoxymethyl benzoguanamine.
  • Commercially available products include Mitsui Cytec Co., Ltd.
  • alkoxymethylated melamine examples include, for example, hexamethoxymethylmelamine.
  • methoxymethyl type melamine compounds (trade names: Cymel 300, Cymel 301, Cymel 303, Cymel 350), butoxymethyl type melamine compounds (trade names: My Coat 506, My Coat 508) manufactured by Mitsui Cytec Co., Ltd., Sanwa Chemical-made methoxymethyl-type melamine compounds (trade names: Nicarak MW-30, Nicarak MW-22, Nicarak MW-11, Nicarac MS-001, Nicarax MX-002, Nicarac MX-730, Nicarac MX-750, Nicarac MX-035) And butoxymethyl type melamine compounds (trade names: Nicarax MX-45, Nicarax MX-410, Nicarac MX-302) and the like.
  • it may be a compound obtained by condensing a melamine compound, urea compound, glycoluril compound and benzoguanamine compound in which a hydrogen atom of such an amino group is substituted with a methylol group or an alkoxymethyl group.
  • a melamine compound urea compound, glycoluril compound and benzoguanamine compound in which a hydrogen atom of such an amino group is substituted with a methylol group or an alkoxymethyl group.
  • examples thereof include high molecular weight compounds produced from melamine compounds and benzoguanamine compounds described in US Pat. No. 6,323,310.
  • trade name Cymel 303 manufactured by Mitsui Cytec Co., Ltd.
  • an acrylamide compound substituted with a hydroxymethyl group or an alkoxymethyl group such as N-hydroxymethylacrylamide, N-methoxymethylmethacrylamide, N-ethoxymethylacrylamide, N-butoxymethylmethacrylamide, or the like
  • a hydroxymethyl group or an alkoxymethyl group such as N-hydroxymethylacrylamide, N-methoxymethylmethacrylamide, N-ethoxymethylacrylamide, N-butoxymethylmethacrylamide, or the like
  • Polymers produced using methacrylamide compounds can also be used.
  • Examples of such a polymer include poly (N-butoxymethylacrylamide), a copolymer of N-butoxymethylacrylamide and styrene, a copolymer of N-hydroxymethylmethacrylamide and methylmethacrylate, and N-ethoxymethyl.
  • Examples thereof include a copolymer of methacrylamide and benzyl methacrylate, and a copolymer of N-butoxymethylacrylamide, benzyl methacrylate and 2-hydroxypropyl methacrylate.
  • the weight average molecular weight of such a polymer is 1,000 to 500,000, preferably 2,000 to 200,000, more preferably 3,000 to 150,000, and even more preferably 3 , 50,000 to 50,000.
  • cross-linking agents can be used alone or in combination of two or more.
  • the content of the crosslinking agent of the component (B) in the thermosetting film-forming composition having photo-alignment property of the present invention is 1 to 40 parts by mass based on 100 parts by mass of the specific copolymer of the component (A). Is more preferable, and 5 to 30 parts by mass is more preferable.
  • content is too small, the solvent tolerance and heat resistance of the cured film obtained from the thermosetting film formation composition which has photo-orientation fall, and the sensitivity at the time of photo-orientation falls.
  • the content is excessive, the photo-alignment property and the storage stability may be lowered.
  • thermosetting film-forming composition having the photo-alignment property of the present invention.
  • a sulfonic acid group-containing compound, hydrochloric acid or a salt thereof, and a compound that generates an acid upon thermal decomposition during pre-baking or post-baking that is, an acid is generated by thermal decomposition at a temperature of 80 ° C. to 250 ° C. If it is a compound, it will not specifically limit.
  • Examples of such compounds include hydrochloric acid, methanesulfonic acid, ethanesulfonic acid, propanesulfonic acid, butanesulfonic acid, pentanesulfonic acid, octanesulfonic acid, benzenesulfonic acid, p-toluenesulfonic acid, camphorsulfonic acid, trifluoromethane.
  • Sulfonic acid p-phenolsulfonic acid, 2-naphthalenesulfonic acid, mesitylenesulfonic acid, p-xylene-2-sulfonic acid, m-xylene-2-sulfonic acid, 4-ethylbenzenesulfonic acid, 1H, 1H, 2H, 2H -Sulfonic acids such as perfluorooctane sulfonic acid, perfluoro (2-ethoxyethane) sulfonic acid, pentafluoroethane sulfonic acid, nonafluorobutane-1-sulfonic acid, dodecylbenzene sulfonic acid, and hydrates and salts thereof.
  • Examples of the compound that generates an acid by heat include bis (tosyloxy) ethane, bis (tosyloxy) propane, bis (tosyloxy) butane, p-nitrobenzyl tosylate, o-nitrobenzyl tosylate, 1,2.3-phenylenetris (Methyl sulfonate), p-toluenesulfonic acid pyridinium salt, p-toluenesulfonic acid morphonium salt, p-toluenesulfonic acid ethyl ester, p-toluenesulfonic acid propyl ester, p-toluenesulfonic acid butyl ester, p-toluenesulfone Acid isobutyl ester, p-toluenesulfonic acid methyl ester, p-toluenesulfonic acid phenethyl ester,
  • the content of the component (C) in the thermosetting film-forming composition having photo-alignment ability of the present invention is preferably 0.01 to 5 parts by mass, more preferably 0 with respect to 100 parts by mass of the component (A). .05 to 3 parts by mass, more preferably 0.1 to 1 part by mass.
  • the content of the component (C) is preferably 0.01 to 5 parts by mass or more, sufficient thermosetting and solvent resistance can be imparted, and high sensitivity to light irradiation can be imparted.
  • the amount is more than 5 parts by mass, the storage stability of the composition may decrease.
  • a sensitizer may be contained as the component (D).
  • This component (D) is effective in promoting the photodimerization reaction after formation of the thermosetting film of the present invention.
  • Component sensitizers include benzophenone, anthracene, anthraquinone, thioxanthone, and derivatives thereof, and nitrophenyl compounds. Of these, benzophenone derivatives and nitrophenyl compounds are preferred. Specific examples of preferred compounds include N, N-diethylaminobenzophenone, 2-nitrofluorene, 2-nitrofluorenone, 5-nitroacenaphthene, 4-nitrobiphenyl and the like. In particular, N, N-diethylaminobenzophenone which is a derivative of benzophenone is preferable.
  • sensitizers are not limited to those described above.
  • the sensitizers can be used alone or in combination of two or more compounds.
  • the use ratio of the sensitizer of the component (D) in the present invention is preferably 0.1 to 20 parts by mass, more preferably 0.2 to 10 parts by mass with respect to 100 parts by mass of the component (A). It is. If this ratio is too small, the effect as a sensitizer may not be sufficiently obtained. If it is too large, the transmittance may be lowered and the coating film may be roughened.
  • thermosetting film-forming composition having photo-alignment property of the present invention is mainly used in a solution state dissolved in a solvent.
  • the solvent used in that case is only required to be able to dissolve the component (A) and the component (B), and if necessary, the component (C), the component (D) and / or other additives described below, and the type and structure thereof. Is not particularly limited.
  • the solvent include, for example, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, methyl cellosolve acetate, ethyl cellosolve acetate, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, propylene glycol, propylene glycol monomethyl ether, propylene glycol monomethyl ether acetate.
  • solvents can be used singly or in combination of two or more.
  • thermosetting film-forming composition having the photo-alignment property of the present invention is a silane coupling agent, a surfactant, a rheology adjusting agent, a pigment, a dye, as long as the effects of the present invention are not impaired.
  • Storage stabilizers, antifoaming agents, antioxidants and the like can be contained.
  • thermosetting film-forming composition having photo-alignment property of the present invention contains (A) an acrylic copolymer and (B) a crosslinking agent, and optionally generates (C) acid or thermal acid. It is a composition which can contain 1 or more types among an agent, the sensitizer of (D) component, and also other additives. Usually, they are used as a solution in which they are dissolved in a solvent.
  • thermosetting film-forming composition having photo-alignment property of the present invention is used as a solution.
  • the ratio of the solid content in the thermosetting film-forming composition having photo-alignment property of the present invention is not particularly limited as long as each component is uniformly dissolved in the solvent, but is 1 to 80% by mass. , Preferably 3 to 60% by mass, more preferably 5 to 40% by mass.
  • solid content means what remove
  • thermosetting film-forming composition having photo-alignment property of the present invention is not particularly limited.
  • a preparation method for example, (A) component is dissolved in a solvent, and (B) component, and further (C) component and (D) component are mixed in this solution at a predetermined ratio to obtain a uniform solution.
  • a method in which other additives are further added and mixed as necessary.
  • thermosetting film-forming composition having photo-alignment property of the present invention a solution of a specific copolymer obtained by a polymerization reaction in a solvent can be used as it is.
  • component (A) obtained by copolymerizing a monomer having a photodimerization site and a monomer having a thermally crosslinkable site
  • component (B) component component, (C) component, (D) Add ingredients to make a uniform solution.
  • a solvent may be further added for the purpose of adjusting the concentration.
  • the solvent used in the process of producing the specific copolymer and the solvent used for adjusting the concentration of the thermosetting film-forming composition having photo-alignment properties may be the same or different.
  • the prepared solution of the thermosetting film-forming composition having photo-alignment property is preferably used after being filtered using a filter having a pore diameter of about 0.2 ⁇ m.
  • thermosetting film, cured film and liquid crystal alignment layer The solution of the thermosetting film-forming composition having photo-alignment which is one embodiment of the present invention is coated with a substrate (for example, a silicon / silicon dioxide-coated substrate, a silicon nitride substrate, a metal such as aluminum, molybdenum, or chromium).
  • a substrate for example, a silicon / silicon dioxide-coated substrate, a silicon nitride substrate, a metal such as aluminum, molybdenum, or chromium.
  • Substrate, glass substrate, quartz substrate, ITO substrate, etc.) and film for example, resin film such as triacetyl cellulose film, polyester film, acrylic film), etc., spin coating, flow coating, roll coating, slit coating,
  • a coating film can be formed by coating by spin coating following the slit, ink jet coating, printing, etc., and then pre-drying (pre-baking) with a hot plate or oven. Then, a cured film is formed by heat-treating (post-baking) this coating film.
  • a heating temperature and a heating time appropriately selected from the range of a temperature of 70 ° C. to 160 ° C. and a time of 0.3 to 60 minutes are adopted.
  • the heating temperature and heating time are preferably 80 to 140 ° C. and 0.5 to 10 minutes.
  • the treatment is performed at a heating temperature selected from the range of 140 ° C. to 250 ° C. for 5 to 30 minutes when on a hot plate, and for 30 to 90 minutes when in an oven. The method is taken.
  • the film thickness of the cured film formed using the thermosetting composition having the photo-alignment property of the present invention is, for example, 0.1 to 30 ⁇ m, taking into account the step difference of the substrate to be used and optical and electrical properties. It can be selected appropriately.
  • thermosetting film-forming composition having photo-alignment property of the present invention By curing the thermosetting film-forming composition having photo-alignment property of the present invention under the above conditions, it is possible to sufficiently cover the step of the substrate and to have high transparency. A film can be formed.
  • thermosetting film having photoalignment formed in this manner can function as a liquid crystal material alignment layer, that is, a layer for aligning a compound having liquid crystallinity, by performing polarized UV irradiation.
  • a liquid crystal material alignment layer that is, a layer for aligning a compound having liquid crystallinity
  • polarized UV irradiation As a method of irradiating polarized UV, ultraviolet light having a wavelength of 150 to 450 nm is usually used, and irradiation is performed by irradiating linearly polarized light from a vertical or oblique direction at room temperature or in a heated state.
  • the liquid crystal alignment layer formed from the thermosetting film composition having photo-alignment property of the present invention has solvent resistance and heat resistance, after applying a retardation material on the liquid crystal alignment layer, the liquid crystal alignment layer By heating to the phase transition temperature, the phase difference material can be brought into a liquid crystal state and photocured to form a layer having optical anisotropy.
  • the retardation material for example, a liquid crystal monomer having a polymerizable group and a composition containing the same are used. And when the base material which forms a liquid crystal aligning layer is a film, it is useful as an optically anisotropic film.
  • Such retardation materials include those having orientation properties such as horizontal orientation, cholesteric orientation, vertical orientation, and hybrid orientation, and can be selectively used depending on the required retardation.
  • liquid crystal is injected between the substrates, and the liquid crystal A liquid crystal display element in which is aligned can also be obtained.
  • thermosetting film-forming composition having photo-alignment property of the present invention can be suitably used for various optical anisotropic films and liquid crystal display elements.
  • thermosetting film-forming composition having photo-alignment property of the present invention is also useful as a material for forming a cured film such as a protective film and an insulating film in various displays such as a thin film transistor (TFT) type liquid crystal display element and an organic EL element.
  • TFT thin film transistor
  • it is also suitable as a material for forming an overcoat material for a color filter, an interlayer insulating film for a TFT type liquid crystal element, an insulating film for an organic EL element, and the like.
  • the number average molecular weight and weight average molecular weight of the acrylic copolymer obtained in accordance with the following synthesis examples were measured using a GPC apparatus (Shodex (registered trademark) columns KF803L and KF804L) manufactured by JASCO Corporation, and the elution solvent tetrahydrofuran was flowed at 1 ml. It was measured under the condition that the column was eluted at a rate of 40 minutes per minute (column temperature: 40 ° C.).
  • Mn number average molecular weight
  • Mw weight average molecular weight
  • Examples 1 to 6 and Comparative Examples 1 to 3 Each composition of Examples 1 to 6 and Comparative Examples 1 to 3 was prepared with the composition shown in Table 1, and a cured film was formed from each composition, and evaluation of solvent resistance, heat resistance, transmittance, and orientation was performed. Was performed as follows.
  • a retardation material solution composed of a liquid crystal monomer was applied onto the substrate using a spin coater, and then prebaked on a hot plate at a temperature of 80 ° C. for 60 seconds to form a coating film having a thickness of 1.4 ⁇ m.
  • the substrate was irradiated with 1,000 mJ / cm 2 of ultraviolet light in a nitrogen atmosphere to cure the retardation material.
  • the exposure amount of polarized UV necessary to show the orientation was defined as the orientation sensitivity.
  • the exposure amount of polarized UV necessary to show orientation is at least 100 mJ / cm 2 or less.
  • the cured films formed from the compositions of Examples 1 to 6 had high heat resistance and transmittance (transparency), and were resistant to both CHN and NMP solvents. In addition, orientation was exhibited with a small exposure amount.
  • the cured films formed from the compositions of Comparative Examples 1 to 3 had low heat resistance and solvent resistance, and required an exposure amount 20 times or more that of the examples in order to exhibit orientation.
  • the cured film formed from the photo-alignable thermosetting film-forming composition of the present invention has good results in all of the properties of light transmittance, solvent resistance, heat resistance, and orientation. It was.
  • thermosetting film-forming composition having photo-alignment property is very useful as a material for an optically anisotropic film or a liquid crystal alignment layer of a liquid crystal display element.
  • a thin film transistor (TFT) type liquid crystal display element organic Materials for forming cured films such as protective films and insulating films in various displays such as EL elements, especially as materials for forming interlayer insulating films for TFT liquid crystal elements, overcoats for color filters, insulating films for organic EL elements, etc. Is also suitable.

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